kalliista
Kalliista is the elative singular form of the Finnish adjective kallis, meaning expensive. In Finnish, adjectives inflect to match the noun they modify, including case. When the noun is in the elative case, the adjective takes the corresponding elative ending, which for this adjective yields kalliista.
Kalliista typically appears before a noun in the elative case, as in phrases such as kalliista autosta
The elative form is used to express origin, source, or movement away from something. In practice, kalliista
Etymology-wise, kallis is a standard Finnish adjective meaning expensive, and kalliista is simply its grammatical inflection
In summary, kalliista is a specific inflected form used in Finnish grammar to connect an expensive noun